Patent GB-1002427-A (GB)
Title: Treatment of textile materials
Inventor: GUEST DOROTHY JOYCE
IPC: D06M15/263
Filed: 1962-09-26
Abstract: Textile materials, e.g. cotton, wool, nylon and viscose rayon, are impregnated first with an aqueous dispersion of polyacrylonitrile or a copolymer thereof and then with an aqueous solution of an organic solvent for polyacrylonitrile or the copolymer thereof which is ethylene carbonate, propylene carbonate, dimethyl formamide, dimethyl acetamide, dimethyl sulphoxide, butyrolactone or mixtures thereof, and are then heated with or withbut the application of pressure to improve their hand, dimensional stability and abrasion resistance or to bond them together to form non-woven fabrics.  The solvents may be present in the aqueous solution in a concentration of 1-50% by weight.  Suitable copolymers are those of acrylontrile with acrylic or methacrylic acid or ethyl or butylacrylate and graft copolymers of acrylonitrile with polyacrylic acid, polyvinyl alcohol or polymethacrylamide.  The crease resistant properties of the textile materials may be improved by incorporating into the polymer dispersion and/or in the aqueous solution of the solvent resin precondensates, e.g. methylol or alkoxymethyl derivatives of urea, triazines, e.g. melamine, triazones or imidazolones, or cross-linking agents, e.g. formaldehyde.  The polymer dispersions and/or aqueous solutions of the solvent may also contain high molecular weight compounds, e.g. water soluble alkali metal salts of alginic acid, water soluble or dispersible cellulose derivatives and cationic polymers such as are prepared by the polymerisation of diethyl aminoethyl methacrylate quaternised with dimethyl sulphate, as resin migration inhibitors. The aqueous dispersion may contain 0.5-50% by weight of the polymer.  Impregnation with the polymer dispersion may be effected at ordinary or elevated temperatures and the materials may then be dried at 15 DEG -120 DEG C.  The textile materials may then be impregnated with the aqueous solution of the organic solvent, dried at 15 DEG -200 DEG C., heat treated and washed.  The textile materials may subsequently be treated with polymers to improve their water, pilling and abrasion resistant properties and in the case of proteinaceous fibres treated with setting agents, e.g. sodium bisulphite or ammonium thioglycollate to confer durable pleating or to set the fabric in the flat state.ALSO:Fabrics, e.g. cotton, wool, nylon and viscose rayon fabrics, are coated with an aqueous dispersion of polyacrylonitrile or a copolymer thereof and then treated with an aqueous solution of an organic solvent for polyacrylonitrile or the copolymer thereof which is ethylene carbonate, propylene carbonate, dimethyl formamide, dimethyl acetamide, dimethyl sulphoxide, butyrolactone or mixtures thereof, and are then heated with or without the application of pressure.  The solvents may be present in the aqueous solution in a concentration of 1-50% by weight. Suitable copolymers are those of acrylonitrile with acrylic or methacrylic acid or ethyl or butylacrylate and graft copolymers of acrylonitrile with polyacrylic acid, polyvinyl alcohol or polymethacrylamide.  The crease resistant properties of the fabrics may be improved by incorporating into the polymer disperson and/or in the aqueous solution of the solvent resin precondensates, e.g. methylol or alkoxymethyl derivatives of urea, triazines, e.g. melamine, triazones or imidazolones, or cross-linking agents, e.g. formaldehyde.  The polymer dispersions and/or aqueous solutions of the solvent may also contain high molecular weight compounds, e.g. water soluble alkali metal salts of alginic acid, water soluble or dispersible cellulose derivatives and cationic polymers such as are prepared by the polymerization of diethyl aminoethyl methacrylate quaternized with dimethyl sulphate, as resin migration inhibitors. The aqueous dispersion may contain 0,5-50% by weight of the polymer. The coating with the polymer dispersion may be effected at ordinary or elevated temperatures and the fabrics may then be dried at 15-120 DEG C.  The fabrics may then be treated with the aqueous solution of the organic solvent, dried at 15-200  DEG C., heat treated and washed.